I'm not sure what I will use for the VCTCXO. I have a few different
ideas to play around with. Testing when I have time over the next couple
of weeks I may find a suitable solution.
Ray,
AB7HE
Original Message
Subject: Re: [time-nuts] WWVB PM Time Questions
From: paul swed
Looked at the KD2BD schematic and it is a 10 MHz VCTCXO. That seems
reasonable perhaps to find.
Regards
Paul
On Wed, Jul 22, 2020 at 6:44 PM paul swed wrote:
> I was actually thinking about this quite a bit and perhaps I went the
> wrong way.
> That is a cheap vcxo class device. His unit was
I was actually thinking about this quite a bit and perhaps I went the wrong
way.
That is a cheap vcxo class device. His unit was not an oven as I recall.
Just maybe a bit too good was actually bad.
Hard to say and no time to play right now.
Regards
Paul
WB8TSL
On Wed, Jul 22, 2020 at 6:06 PM Bob
Hi
> On Jul 22, 2020, at 3:51 PM, paul swed wrote:
>
> Ray watch out for my comment on the KD2BD solution. That oscillator isn't
> available and I have not been able to map something else into it. Tried
> several good grade Oven oscillators. Just be aware of that issue.
> Would need to do
The generic WWVB receivers in radio-controlled clocks are essentially
TRF receivers using a 60kHz crystal as the tuned element.
David N1HAC
On 7/22/20 2:26 PM, Hal Murray wrote:
tsho...@gmail.com said:
I myself did some experimenting with a tuned loop antenna through a 60 kHz
crystal
Ray watch out for my comment on the KD2BD solution. That oscillator isn't
available and I have not been able to map something else into it. Tried
several good grade Oven oscillators. Just be aware of that issue.
Would need to do more tinkering and simply don't have that time right now.
Also it
Thanks to all for the suggestions. I dug a ferrite rod AM radio antenna
out of the box this morning. I have a box of 10 left over from the late
80s. It measures 0.950 mH so I will add some turns to get it to 1.5 mH
which will be easier to resonate at 60 kHz. Then I need to build up the
RF amp and
Is there a gnu radio receiver? Should be able to handle this speed.
Don
On 2020-07-22 11:41, Tim Shoppa wrote:
The ES100 module sold by universal-solder.ca which Tom introduced us to
a
couple years ago, is now End-Of-Life. "A new module is currently in
development".
Software Costas, see MatLab:
https://www.mathworks.com/matlabcentral/fileexchange/16744-demodulating-a-bp
sk-using-costas-loop?s_tid=FX_rc2_behav
Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y
les...@veenstras.com
452 Stable Ln (HC84 RFD USPS Mail)
Keyser WV 26726
GPS: 39.336826 N 78.982287 W
tsho...@gmail.com said:
> I myself did some experimenting with a tuned loop antenna through a 60 kHz
> crystal bandpass hooked to a ...
What is the bandwidth of the WWVB signal?
What is the bandwidth of a crystal filter? (or probably, what are my choices,
and what do I get if I use a low cost
The ES100 module sold by universal-solder.ca which Tom introduced us to a
couple years ago, is now End-Of-Life. "A new module is currently in
development".
https://www.universal-solder.ca/product/everset-es100-cob-wwvb-60khz-bpsk-receiver-kit-with-2-antennas/
I myself did some experimenting
The KD2BD receiver is a costas loop.
So look at that and you have the answer. It does not decode the BPSK data
though. Thats quite a project all by itself.
Regards
Paul
On Wed, Jul 22, 2020 at 10:42 AM Rodger via time-nuts <
time-nuts@lists.febo.com> wrote:
> Hey Ray,
>
> Paul and I have a nice
Hi Ray,
A similar project has been on my to-do list for a couple of years now
(so don't hold your breath!). It should be possible to do this using
the built-in ADC for a really nice, minimalist demonstration of SDR
principles. The STM32L4 series which I often use has a pretty decent
ADC: fast
On 7/22/2020 7:35 AM, Rodger via time-nuts wrote:
Hey Ray,
Paul and I have a nice piece of code that generates the WWVB BPSK bit stream
using an Arduino and a ublox GPS module. (total cost under $30) You could
use this as a WWVB emulator while you're working on your code. Sorry, I
can't
Ray: If you will pardon the obvious, once digitized, in software, simply
square to remove the phase, or better still, a Costas Loop to sync demod.
Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y
les...@veenstras.com
452 Stable Ln (HC84 RFD USPS Mail)
Keyser WV 26726
GPS: 39.336826 N 78.982287 W
Hey Ray,
Paul and I have a nice piece of code that generates the WWVB BPSK bit stream
using an Arduino and a ublox GPS module. (total cost under $30) You could
use this as a WWVB emulator while you're working on your code. Sorry, I
can't really help with your question about demodulating the
Hi
The gotcha is that all X7R tells you is that the temperature dependence of the
part
falls inside a certain set of limits. Back many decades ago there were very few
formulas
out there to make this or that spec part. Pretty much everybody made a part
type with
the same material.
Since the
On 2020-07-22 03:39, Richard (Rick) Karlquist wrote:
>
>
> On 7/21/2020 4:27 PM, Magnus Danielson wrote:
>
>>
>> In capacitors, two things make them microphonic, voltage over the
>> capacitor and the high-dielectric constant as this makes it more
>> sensitive to mechanical stress, and this also
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